Disappointed with KDE 4's performance and other shortcomings, Timothy Pearson continued KDE 3.5 development under the name Trinity. Today the first third major update of the Trinity Desktop Environment is released, providing an alternative upgrade path for KDE users who do not feel comfortable with KDE 4.

Any plans to use Qt4 as backend instead of Qt3? (similarly to what Clementine guys did with Amarok code base).

I don't think the Clementine guys simply swamped toolkits, nor is doing that trivial when there is no backward compatibility between QT4 and QT3. If you read the project page, the devs state that the Clementine Project is inspired by Amarok, not a fork of it. There was a fork of Amarok 1.4.10, Pana, that used qt3 but development ceased this past August.